What Is a Static Transfer Switch (STS)? What Does a Static Transfer Switch Do?

Static Transfer Switch (STS) is a power transfer system that automatically transfers critical electrical loads between two different power sources in a very short time. It helps protect sensitive equipment against power outages, voltage drops, frequency problems, and source failures.

Elsipower provides professional solutions for static transfer switch systems, STS units, UPS systems, and critical power infrastructure. For the right STS solution for your project, call us at +90 212 210 75 51 or send an email to elsi@elsi.com.tr.

What Is a Static Transfer Switch?

A Static Transfer Switch is an electronic transfer device that continuously monitors two power sources and transfers the load to the healthy source when a problem occurs. STS systems are commonly used between two UPS systems, two mains supplies, UPS and generator systems, or different backup power sources.

Static transfer switches are preferred in places where power continuity is critical, such as server rooms, data centers, hospitals, factories, telecommunication centers, banks, and industrial facilities.

What Does a Static Transfer Switch Do?

A static transfer switch helps prevent critical loads from being affected by power interruptions or poor power quality. If the main source fails, the STS transfers the load to the backup source quickly and automatically.

• Provides automatic transfer between two power sources.
• Helps prevent critical equipment from losing power.
• Can be used with UPS and generator systems.
• Supports server rooms, medical devices, production lines, and automation systems.
• Reduces the risk of data loss, downtime, and production interruption.

How Does a Static Transfer Switch Work?

An STS continuously checks both connected power sources. When it detects voltage drop, outage, frequency problem, or power quality issue on the main source, it transfers the load to the second source within a very short time.

This transfer is performed by electronic semiconductor components. For this reason, static transfer switch systems are much faster than mechanical transfer systems and are ideal for sensitive electrical loads.

Where Are Static Transfer Switch Systems Used?

STS systems are used in many areas where uninterrupted power is required. They are especially important in facilities where power failure may cause data loss, production downtime, device malfunction, or safety risks.

STS Usage in Server Rooms

STS systems in server rooms are important for continuous operation. Servers, switches, firewalls, storage units, and network devices can be directly affected by sudden power interruptions.

A static transfer switch monitors two power sources in the server room. If the main source fails or voltage problems occur, it quickly transfers the load to the backup source. This helps reduce server shutdowns, data loss, and system access problems.

STS Usage in Factories

STS usage in factories is important for production continuity. Production machines, automation panels, PLC systems, CNC machines, robotic lines, and control systems may be seriously affected by power failures.

Unexpected power outages can cause production stops, product loss, machine errors, and time loss. A static transfer switch helps transfer the load to an alternative power source quickly and supports safer operation of production lines.

STS Usage in Hospitals

STS systems in hospitals are used to support uninterrupted operation of critical medical devices. Operating rooms, intensive care units, laboratory equipment, imaging systems, and patient monitoring systems require continuous power.

In hospital projects, the correct STS capacity, UPS compatibility, and generator compatibility should be carefully evaluated. For a suitable solution, you can contact Elsipower.

STS Usage in Data Centers

Data centers are among the most critical facilities that require uninterrupted power. Shutdown of servers, network devices, and storage systems may cause serious service interruptions and data loss.

Static transfer switch systems support power continuity in data centers by providing fast transfer between two different power sources.

STS Usage in Telecommunication Systems

Base stations, communication centers, network infrastructures, and telecom systems require reliable power. STS systems are preferred in these areas to improve energy security and continuity.

Single Phase and Three Phase STS Systems

STS systems can be selected as single phase STS or three phase STS depending on the load capacity and application area.

Single Phase STS Systems

Single phase static transfer switch systems are generally used for lower power applications. They can be preferred for small server rooms, office systems, security systems, automation devices, and sensitive electronic equipment.

Single phase STS systems provide fast transfer between two sources for equipment operating on 220V power infrastructure.

Three Phase STS Systems

Three phase static transfer switch systems are used in higher power facilities such as factories, hospitals, data centers, large production plants, and industrial applications.

Three phase STS systems help safely feed critical loads operating on 380V power infrastructure.

STS vs ATS: What Is the Difference?

STS and ATS systems are both used to transfer loads between power sources, but their structure and application areas are different.

ATS, or Automatic Transfer Switch, usually works with mechanical contactors or motorized switches. It is commonly used for generator transfer applications. However, its transfer time may be longer than STS systems.

Static Transfer Switch uses electronic semiconductor components and performs the transfer much faster. For this reason, STS is often more suitable for sensitive electronic devices, server rooms, data centers, hospitals, and critical production lines.

• STS: Provides very fast transfer.
• ATS: Commonly used for generator transfer.
• STS: Suitable for sensitive loads.
• ATS: Used for general power transfer applications.
• STS: Frequently used with UPS systems.
• ATS: Mechanical transfer time may be longer.

Can UPS and STS Be Used Together?

Yes, UPS and STS systems can be used together. In many critical power infrastructures, these two systems are preferred together. While the UPS provides uninterrupted power to the load, the STS enables fast transfer between different UPS units or power sources.

For example, a system may have two different UPS outputs. If one UPS fails or requires maintenance, the STS can transfer the load to the other UPS source. This makes power continuity safer and more reliable.

What Should Be Considered When Choosing a Static Transfer Switch?

Choosing the right static transfer switch requires proper analysis of the facility power infrastructure and load requirements.

• The load capacity must be calculated correctly.
• Single phase or three phase requirement must be determined.
• Input and output voltage values must be checked.
• UPS and generator compatibility should be evaluated.
• Transfer time should be suitable for the application.
• The electrical infrastructure of the facility should be examined.
• Technical service and maintenance support should be considered.

Incorrect STS selection may prevent the system from performing as expected. Therefore, professional support is important.

STS Maintenance and Technical Service Support

Static transfer switch systems should be inspected regularly for safe operation. Connections, source inputs, output values, alarm records, and general working conditions should be checked periodically.

With regular maintenance, possible faults can be detected in advance. In critical facilities, STS maintenance, UPS maintenance, and power infrastructure checks should be evaluated together.

For technical support about STS systems, UPS systems, and power infrastructure, call Elsipower at +90 212 210 75 51 or send an email to elsi@elsi.com.tr.

Elsipower Static Transfer Switch Solutions

Elsipower provides reliable and professional power solutions for businesses that require energy continuity. You can receive expert support for static transfer switch, STS systems, uninterruptible power supply, UPS systems, and critical power infrastructure.

To get detailed information about the most suitable STS system for your business, call +90 212 210 75 51 or email elsi@elsi.com.tr.

Frequently Asked Questions

What is a Static Transfer Switch?

A Static Transfer Switch is an electronic power transfer system that provides fast and automatic transfer between two different power sources.

What does a static transfer switch do?

It helps prevent critical equipment from losing power in case of power outage, voltage problem, or source failure.

Where is STS used?

STS is used in server rooms, data centers, hospitals, factories, banks, telecommunication systems, and facilities with critical power requirements.

Why is STS important in server rooms?

It helps protect servers, network devices, and storage systems from sudden power interruptions.

What does STS do in factories?

It supports production continuity by helping protect automation systems, machines, and critical production equipment.

Why is STS used in hospitals?

It supports uninterrupted operation of medical devices, intensive care equipment, and operating room systems.

What is single phase STS?

Single phase STS is a static transfer switch solution used for lower power systems operating on 220V infrastructure.

What is three phase STS?

Three phase STS is a static transfer switch system used for higher power facilities operating on 380V infrastructure.

What is the difference between STS and ATS?

STS uses electronic components and provides faster transfer. ATS is generally mechanical and may have a longer transfer time.

Can STS be used with UPS?

Yes. STS systems can be used with UPS, generator, and different mains power sources.

How to choose the right static transfer switch?

Load capacity, facility infrastructure, voltage value, transfer time, single phase or three phase requirement should be considered.

Does STS require technical service?

Yes. Regular maintenance and technical control are important for safe operation of critical power systems.

Contact Elsipower for STS and Static Transfer Switch Solutions

If you are looking for a reliable static transfer switch, STS system, single phase STS, three phase STS, UPS compatible STS, or critical power transfer solution, you can contact the Elsipower expert team.

Phone: +90 212 210 75 51

Email: elsi@elsi.com.tr